Titan Extruder Users Need to Adjust X2_MIN_POS

[klack]

This only affects those that have upgraded to Hictop's Titan extruders. Since they are both left extruders, E2 will crash into E1 when trying to goto X0.

For those users
Nextion-for-Marlin-2/Marlin_2.0.6- HICTOP/Marlin_2.0.6- HICTOP/Marlin/Configuration_adv.h:602

Should be adjusted so that
X2_MIN_POS = 15

Not really a way to fix this, maybe it can be added to the readme.md?

[ccomincini]

@klack I'm unable to correctly set the x offset of the 2 titan extruders on my tenlog d3 pro. Can you suggest me how to proceed?

[klack]

Why are you unable to set it?